773-131

This premium two-stage air pressure switch is a critical safety and performance component designed for high-efficiency residential gas furnaces and HVAC systems. As an essential air-proving sensor, it monitors the vacuum pressure generated by the draft inducer motor to ensure that combustion gases are being safely and effectively vented out of the heat exchanger. Engineered for dual-stage heating units, it features two distinct set points to manage different airflow requirements during high-fire and low-fire operation. If your furnace is experiencing ignition failure, intermittent cycling, or pressure switch lockout codes, this reliable replacement part ensures your heating system meets the necessary safety parameters for operation. Built for durability and precision, it helps maintain optimal fuel efficiency and protects your home from improper venting conditions.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Used in two-stage gas furnaces and heating systems to monitor venting pressure and ensure the draft inducer is functioning correctly before ignition.
Specifications: Two-stage operation; Low-stage set point: 0.35" WC; High-stage set point: 0.60" WC; Diaphragm-actuated safety sensor.